PSLE The ratio of the number of skirts to that of coats in a shopping centre was 11 : 8 at first. After 35 coats were sold, the ratio of the number of skirts to that of coats became 2 : 1. What was the total number of skirts and coats in the shopping centre at first?
|
Skirts |
Coats |
Total |
Before |
11x2 = 22 u |
8x2 = 16 u |
38 u |
Change |
|
- 35 |
|
After |
2x11 = 22 u |
1x11 = 11 u |
33 u |
The number of skirts remains unchanged.
Make the number of skirts the same.
LCM of 8 and 11 is 22.
Number of coats sold
= 16 u - 11 u
= 5 u
1 u = 35 ÷ 5 = 7
Total number of skirts and coats at first
= 22 u + 16 u
= 38 u
= 38 x 7
= 266
Answer(s): 266